Improvement in air-pumps



UNITED STATES PATENT QEETCE.

H. H. HENDRICK, OF CINCINNATI, OHIO, ASSIGNOR T() HIMSELF AND J. J.-RIDDLE, OF SAME PLAGE.

IMPROVEMENT IN AIR-PUMPS.

To aZZ whom, it may concern:

Be it known that I, II. H. HENDRICK, of Cincinnati, in the county ot'Hamilton and State of Ohio, haveinvented a new and usei'ul Improvementin Valves for Air-Pumps; and I do hereby declare that the following is afull, clear, and exact description ot' the same, reference being had tothe accompanying drawings, forming part of this specilication, in which-Figure l represents a longitudinal central section of my invention. Fig.2 is a similar section of a modification of the same.

Similar letters of reference in both views indicate corresponding parts.v

This invention consists in the application of a cone-valve made of orcovered with indiarubber, leather, or other flexible material, incombination with a common hard-metal valveseat, and with a reciprocatingpiston, in ,such a manner that any impurities-such as hairs orfiber-which may detach themselves from the packing ofthe piston andlodge between the valve and its seat, do not prevent the valve fromclosing down airtight, and the operation ofthe pump is not interrupted.

A modification of my invention consists in the application of an indiarubber or leather valve-seat or metal valve-seat, covered with leatheror other flexible materials,in eombiuation with a cone-valve made ofindiarubber or hard metal and with a reciprocating piston in fuch amanner that the valve is enabled to close down tight notwithstandinghairs, bers, or other small impurities may lodge between it and itsseat.

To enable others skilled in the art to make and use my invention, I willproceed to describe it.

A represents the barrel or cylinder of an ordinary air-pump, made ofbrass or other suitable material and provided with a piston, B, to whicha reciprocating motion is imparted by a handle, C.

D is a cone-valve which closes in its seat E, being held in place by aspring, F. Itthe piston moves toward the valve, it closes, or ought toclose, air-tight in order to insure a correct operation of the pump.

If the valve and its seat are both made of hard metal, and ground upcarefully, said valve will close air-tight, provided no impurities getbetween it and its seat; but in working the piston hairs or fibers vorother small particles are liable to detach themselves and to lodge onthe valve-seat and the operation of the pump is interrupted. In order toavoid this di'iculty, I use a valve of indiarubber, (suchas shown inFig. 2,) or instead ot' india-rubber, leather, or other "liexiblematerial. By these means the valve is enabled to close downperfectlytight in its seat, even if hairs, fibers, or other smallparticles lodge on the latter and the operation of the pump is renderedmuch more certain than it is with valves or valveseats of the ordinaryconstruction.

I. am aware that it is common to construct pumps of various descriptionswith yielding valves or valve-seats, and therefore do not claim noveltyin this principle; but

I do claim as new and desire to Secure by Letters Patent- In an air-pumpofthe construction specified, the combination of the elastic valve Dwith the seat E, spring F, cylinder A, and piston B, all arranged andoperatin g as described.

H. H. HENDRIOK.

Vitnesses '.IHos. S. J. DoUGLAs, D. ROBERTSON.

